Analog to digital converter using subranging and interpolation
US6570523B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2002 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Mar 13, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/365
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A multistage ADC that subranges and interpolates, and that amplifies selected subranges to convert an analog signal to a stream of digital values. The ADC samples the analog signal and provides a stream of sample signals. A first stage flash converts each sample signal into a first multiple bit value and subranges a reference ladder according to the first multiple bit value into selected reference signals. Each additional secondary stage amplifies a selected subrange of signals from a prior stage, flash converts the amplified residual signals to provide an additional multiple bit value, interpolates each set of amplified residual signals and subranges the interpolated signals according to the corresponding multiple bit value. A final stage amplifies and flash converts to determine a final multiple bit value. An error corrector combines each set of multiple bit values into a digital value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.